Find the interval estimate for the mean of paired difference with 95% confidence level. (sd = 1.34) Driver Original Oil Synthetic Oil 1 2 3 4 5 6 7 15 18.4 17.3 20 23.5 23 19 16.7 17 19 19.8 22 24 19.5 O a. (-1.25, 0.73) O b. (-1.46, 0.94) O c. (-1.25, 0.73) O d. (-0.64, 0.12)

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A:

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